<template>
  <view class="cart-container" v-if="cart.length !== 0">
    <!-- 收货地址组件 -->
    <my-address></my-address>
    <!-- 购物车列表标题区域 -->
    <view class="cart-title">
      <!-- 左侧图标 -->
      <uni-icons type="shop" size="18"></uni-icons>
      <!-- 右侧文本 -->
      <text class="cart-title-text">购物车</text>
    </view>
    <!-- 购物车商品信息列表 -->
    <uni-swipe-action>
      <block v-for="(goods, i) in cart" :key='i'>
        <uni-swipe-action-item :right-options="options" @click="swiperItemClickHandler(goods)">
          <my-goods :good="goods" :showRatio="true" :showNum="true" @ratio-change="ratioChangeHandler"
            @num-change="numberChangeHandler"></my-goods>
        </uni-swipe-action-item>
      </block>
    </uni-swipe-action>
    <my-settle></my-settle>
  </view>
  
  <!-- 空白购物车时区域显示内容 -->
  <view class="empty-cart" v-else>
    <image src="/static/my-icons/cart_empty@2x.png" class="empty-cart-img"></image>
    <text class="tip-text">空空如也~</text>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  import {
    mapState,
    mapMutations
  } from 'vuex'

  export default {
    mixins: [badgeMix],
    computed: {
      ...mapState('m_cart', ['cart']),
    },
    data() {
      return {
        options: [{
          text: '删除',
          style: {
            backgroundColor: '#c00000'
          }
        }]
      };
    },
    methods: {
      ...mapMutations('m_cart', ['updateGoodsState', 'updateGoodsCount', 'removeGoodsById']),
      // 调用改变ratio选中状态方法
      ratioChangeHandler(e) {
        this.updateGoodsState(e)
      },
      // 调用改变购物车商品数量方法
      numberChangeHandler(e) {
        this.updateGoodsCount(e)
      },
      // 调用删除购物车的商品方法
      swiperItemClickHandler(goods){
        this.removeGoodsById(goods.goods_id)
      }
    }
  }
</script>

<style lang="scss">
  .cart-container{
    padding-bottom: 50px;
  }
  .cart-title {
    height: 40px;
    display: flex;
    align-items: center;
    padding-left: 5px;
    border-bottom: 3px solid #e3e3e3;

    .cart-title-text {
      margin-left: 10px;
      font-size: 14px;
    }
  }
  .empty-cart{
    display: flex;
    flex-direction: column;
    align-items: center;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .empty-cart-img{
      height: 100px;
      width: 100px;
    }
    .tip-text{
      font-size: 15px;
      color: gray;
      margin-top: 15px;
    }
  }
  
</style>
